Best is to make contact with the HP repair centre directly. http://h40058.www4.hp.com/benchrepair/
I've never heard of any good 3rd party repair companies, well not in CPT at least. You'll probably find the the price to repair said notebook would be better spend toward buying a new one.
Hope it helps.
Hi Andy. Thank you for the recommendation. I am currently in contact with them. As for the cost, the motherboard replacement will be about R4000. Not sure if I can get the same spec in a new machine for that price. Maybe double that. The quotation rejection fee is R200 so lets see what the actual problem is. Thanks again.